first lady michelle obama. she's arrived in the stadium. we're going to go off the air in a couple of minutes. seemed, though, that the grandchildren got a rousing reception from the crowd. [ cheers ] >> reporter: the reaction to president obama's visit. the relationship between president obama and africa as a whole, but especially south africa because as you've been talking about, his friendship with nelson mandela. very profound. and you could feel it, this place lit one cheers and excitement as soon as the cameras showed president obama had arrived. he will speak as a singular honor, having been invited to speak. they only met that one time. but really there are -- they are brothers in arms in a struggle that nelson mandela began and advanced and continues. >> that greeting there, that was the secretary general, ban ki-moon, taking the podium. only one meeting. president obama in south africa months ago as nelson mandela was ailing at home chose ton visit at that time. did go to robben island on that visit. brought his daughters to robbe